diff --git a/tests/produce_data_withOptional.ipynb b/tests/produce_data_withOptional.ipynb
index c7c7b99a8edfcb0d7b7a1cb035eaa43d4ebe89f0..f1979f82c859308b67b8e84da88dca23569ffb0a 100644
--- a/tests/produce_data_withOptional.ipynb
+++ b/tests/produce_data_withOptional.ipynb
@@ -43,7 +43,7 @@
     "grid = RegularGrid( lat_resolution=1.9, lon_resolution=2.5, )\n",
     "\n",
     "configs = dict()\n",
-    "for year in range (2,19):\n",
+    "for year in range (0,19):\n",
     "    valid_data = Config(\n",
     "        grid,\n",
     "        TimeSample( start=dt(2000+year,1,1), end=dt(2000+year,12,31), sampling=\"daily\"),#possibly adopt range:-)\n",